Not even macOS compatible.
RX580 2048 SPs are fake cards made for the chinese market. Real RX 580 have 2304 SPs (StreamProcessors/CUs).
Manufacturers get 2nd hand RX 570 chips removed from abused crypto mining GPUs and then make a fake RX 580 with a new PCB. The fake have a different PCIe ID from the real one.
Apple AMD drivers
does not work with these 2048 SPs GPUs.
This is also suspect, since a
real RX 560 have 1024SPs and these one is 896SPs. Never got a RX 560 896SPs, so I can't say if the Apple AMD drivers work or not with this one.
Some RX 560 models do not require additional power, the power is fully drawn from the PCIe slot.
I personally don't really like to use the PCIe slot power to the limit like this GPUs does, but maybe works fine for your workflow.
On the cheap, your best bet is 2nd GPUs sourced locally, a real RX 580 with 2304SPs.
If you can't find one, maybe try one of the AMD Pro cards, like the
AMD Radeon Pro WX 7100 that is the Radeon Pro equivalent of the standard RX 580 2304 SPs.
Buying these directly from AMD store have no chance of fakes, have full warranty, require one PCIe slot only, are very cool/silent GPUs and require just one 6-pin power connector.
The Radeon Pro wx 7100 graphics card is the world's most powerful single-slot workstation GPU and is designed for VR and the immersive computing era. Vr, or virtual reality, is emerging as the next major industry inflection point for design & manufacturing as well as media & entertainment workflo...
www.amazon.com
These Radeon Pro GPUs like the WX 7100 are very sought after for studio usage, cool, almost completely silent, one PCIe slot only.
Expensive? Yep, but you have what you pay.